Apple Airport Extreme 6th Gen and Time Capsule

The Airport Express 2nd gen was released in 2012 after the 2012's WWDC (the same WWDC where the MacBook Pro Retina was announced), not during the live event, but it appeared on the Apple Website. It is also the last Airport Express to be released.

The main use of the Airport Express 2nd or even 1st gen is to airplay music, or use it as a Wi-Fi receiver and allow devices to connect via ethernet (sort of wifi to ethernet bridge) Compared to the first gen which came out in 2008, it has Airplay 2 capabilities, which means multiroom audio. It also have a better wifi chip and Wi-Fi standard, which makes it faster for Airplaying music or just faster internet overall. Now it has dual band wifi, two antennas one for 2,4Ghz and one for 5Ghz which means both can be used at the same time, so you can connect 2,4Ghz devices and 5Ghz devices at the same time. It can also extend the wifi of another Airport device, but not any other router, as stated by Apple :

The redesign of the Airport Express makes it feel more premium, now it can sit on my desk and look like a little Mac. it also harmonizes the design with the Airport Extreme 5th Gen and TimeCapsule that came out a year after. I also like the smaller status LED on the front, which is less intrusive than the big one on the first gen. And for the IOS or IpadOS integration, it's the same as the first gen, it appears in the Wi-Fi settings and you can see the status of the Airport Express, change the name, password and other settings. Which I still find amazing for a deprecated device.

After some digging on internet I found two interesting website. One open and dissasemble the airport express 2nd gen to connect to the debug and do some non user-intended test :

I also found a airport wiki for that kind of testing but sadly nothing remains of it apart a few WayBack machine saves